How to configure CM600 for Xfinity?

Hi,
I got new Xfinity cable service. Decided to use my own CM600. Cannot get internet. Xfinity support cannot help because it is not their modem.

1. Gave my modem number and MAC address to Xfinity, they told me it works OK.
2. Cable status is good (full status below).
3. PC is connected directly to the CM600 by a single ethernet cable.
4. If I assign static IP 192.168.100.99/24 to my PC (as suggested by CM600 manual), then I can ping CM600 at 192.168.100.1, I can access it via browser, view status, change password, etc.
5. Now what? The manual does not tell what should be my PC config to access internet.
Should I continue using static IP? Or try DHCP?
I tried both and nothing works:
netsh interface ip set address name="Local Area Connection" static 192.168.100.99 255.255.255.0 192.168.100.1 1

ping 192.168.100.1

 works
ping 8.8.8.8
fails
netsh interface ip set address "Local Area Connection" dhcp
DHCP never responds.

One more strange thing: LAN MAC address of CM600 is completely different from the one printed on the device and it actually:
00:09:5b:de:ad:02
What does this "de:ad" means?
It cannot be just a random number. Can it be some error code?

Another question: is there any significance to "IP Provisioning Mode Honor MDD IPv6 only"?
Can I expect to have IPv4 working on LAN despite this?

Is there a way to make CM600 work with Xfinity or should I return it?

Thank you

This is the status:
Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 555000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enable BPI+
IP Provisioning Mode Honor MDD IPv6 only

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 24 555000000 Hz -2.2 dBmV 39.0 dB 0 0
2 Locked QAM256 25 561000000 Hz -2.2 dBmV 38.8 dB 0 0
3 Locked QAM256 26 567000000 Hz -2.5 dBmV 38.9 dB 0 0
4 Locked QAM256 27 573000000 Hz -2.3 dBmV 38.4 dB 0 0
5 Locked QAM256 28 579000000 Hz -2.5 dBmV 38.2 dB 0 0
6 Locked QAM256 29 585000000 Hz -2.5 dBmV 39.2 dB 0 0
7 Locked QAM256 30 591000000 Hz -2.5 dBmV 39.3 dB 0 0
8 Locked QAM256 31 597000000 Hz -2.6 dBmV 39.7 dB 0 0
9 Locked QAM256 32 603000000 Hz -2.4 dBmV 39.8 dB 0 0
10 Locked QAM256 33 609000000 Hz -2.5 dBmV 39.8 dB 0 0
11 Locked QAM256 34 615000000 Hz -2.6 dBmV 39.7 dB 0 0
12 Locked QAM256 35 621000000 Hz -3.0 dBmV 39.5 dB 0 0
13 Locked QAM256 36 627000000 Hz -3.2 dBmV 39.3 dB 0 0
14 Locked QAM256 37 633000000 Hz -3.4 dBmV 39.2 dB 0 0
15 Locked QAM256 38 639000000 Hz -3.7 dBmV 38.9 dB 0 0
16 Locked QAM256 39 645000000 Hz -3.3 dBmV 39.3 dB 0 0
17 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
18 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
19 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
20 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
21 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
22 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
23 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
24 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0

Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 7 5120 Ksym/sec 30300000 Hz 42.3 dBmV
2 Locked ATDMA 5 5120 Ksym/sec 17300000 Hz 42.8 dBmV
3 Locked ATDMA 6 5120 Ksym/sec 23700000 Hz 42.3 dBmV
4 Locked ATDMA 8 5120 Ksym/sec 36700000 Hz 42.5 dBmV
5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV